Bent Northrop Memorial Library

Their magic tree house takes Jack and Annie deep into the sea, where they meet up with dolphins, sharks, and octopi as they search for the answer to an ancient riddle.

Ruthless Austrian entrepreneur Edward Bolcke has managed to steal a crucial component of the U.S. Navy's latest submarine technology--and he has found a way to hijack the world's supply of rare earth minerals. The three Pitts, along with longstanding sidekick Al Giordino, use their usual mix of brains and brawn to see that justice is served.

Ty discovers an entire township chained to a sunken submarine, its inhabitants condemned to an icy underwater grave. It's only the first clue to a mystery that has claimed hundreds of lives and stands to claim two more -- - lives very precious to Ty and his Topsider ally, Gemma.

"When the CIA realizes the identities of three American spies in Brazil have been compromised, they turn to Juan Cabrillo and the crew of the Oregon to rescue the agents. What seems a routine operation turns out to be a trap designed by Juan Cabrillo's greatest enemy, a man driven by hate to seek the ultimate revenge. At the heart of the plot is a state-of-the-art ship that is identical to the Oregon: same weaponry, same technology, same ability to...